<template>
  <view>
    <!-- 使用自定义搜索组件 -->
   <my-search 
   @click="gotoSearch"
  ></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" class="left-scroll-view">
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-view-item',index===active?'active':'']" @click="activeChanged(index)">
            {{item.cat_name}}</view>
        </block>
      </scroll-view>

      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="index2">
          <view class="cate-lv2-title">
            /{{item2.cat_name}}/
          </view>
          <!-- 三级分类 -->
          <view class="cate-lv3-list">
            <!-- 三级分类item -->
            <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3"
            @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar_badge.js'
  export default {
     mixins:[badgeMix],
    data() {
      return {
        // 当前设备可用屏幕高度
        wh: 0,
        // 分类列表数据
        cateList: [],
        // 二级分类列表
        cateLevel2: [],
        // 当前选中分类项
        active: 0,
        // 右侧滚动条与顶部距离
        scrollTop:0,
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      console.log(sysInfo)
      // 获取屏幕可用高度，其中-50是减去搜索框占据高度
      this.wh = sysInfo.windowHeight-50
      this.getCateList()
    },
    methods: {
      // 获取分类列表数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(index) {
        this.active = index
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop=this.scrollTop===0?1:0
      },
      // 跳转商品页面
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
  }

  .left-scroll-view {
    width: 120px;
  }

  .left-scroll-view-item {
    background-color: #f7f7f7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;

    &.active {
      background-color: #ffffff;
      position: relative;

      &::before {
        content: ' ';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #C00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);

      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      image{
        width: 60px;
        height:60px;
      }
      text{
        font-size: 12px
      }
    }
  }
  .my-search-container{
    height: 50px;
    display: flex;
    align-items: center;
    padding: 0 10px;
     .my-search-box{
          height: 36px;
          background-color: #ffffff;
          width: 100%;
          display: flex;
          justify-content: center;
          align-items: center;
        }
  }
</style>